Rozhen Observation Calendar

Which nights are best for a target over the coming weeks. The astronomy mark (darkness × altitude × Moon) is computed for every night; the weather and the overall mark exist only where Open-Meteo has a forecast (the next four days) or ERA5 history (past nights) — the rest is honestly blank.

Best nights for Triangulum Pinwheel: 10-13 (100), 10-14 (100), 10-15 (100), 10-16 (100), 10-28 (100) — by astronomy; check the weather when the night is within four days.

2029-10-13astronomy score per night — click a bar for that night2029-11-11

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2029-10-13 Sat	100	—	unknown	20:20–06:00 (good, 9.67 h)	79.1° 01:25	9.75	44%	107.4°
2029-10-14 Sun	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.1° 01:20	9.79	55%	94.6°
2029-10-15 Mon	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.1° 01:20	9.83	65%	82.2°
2029-10-16 Tue	100	—	unknown	21:10–06:05 (good, 8.92 h)	79.1° 01:15	9.88	74%	70.0°
2029-10-17 Wed	99	—	unknown	23:20–06:05 (good, 6.75 h)	79.1° 01:10	9.92	82%	58.2°
2029-10-18 Thu	91	—	unknown	02:55–06:10 (good, 3.25 h)	79.1° 01:05	9.96	89%	46.7°
2029-10-19 Fri	83	—	unknown	05:40–06:10 (good, 0.5 h)	79.1° 01:00	10.0	94%	35.6°
2029-10-20 Sat	41	—	unknown	01:25–06:10 (marginal, 4.75 h)	79.1° 01:00	10.05	98%	25.5°
2029-10-21 Sun	31	—	unknown	03:00–06:10 (marginal, 3.17 h)	79.1° 00:55	10.09	100%	17.5°
2029-10-22 Mon	30	—	unknown	20:05–22:55 (marginal, 2.83 h)	79.1° 00:50	10.13	100%	15.5°
2029-10-23 Tue	35	—	unknown	20:05–23:40 (marginal, 3.58 h)	79.1° 00:45	10.17	98%	21.2°
2029-10-24 Wed	44	—	unknown	20:00–01:05 (marginal, 5.08 h)	79.1° 00:40	10.21	94%	30.5°
2029-10-25 Thu	83	—	unknown	20:00–20:10 (good, 0.17 h)	79.1° 00:40	10.25	89%	41.1°
2029-10-26 Fri	89	—	unknown	20:00–23:55 (good, 3.92 h)	79.1° 00:35	10.29	83%	52.3°
2029-10-27 Sat	97	—	unknown	20:00–03:15 (good, 7.25 h)	79.1° 00:30	10.32	75%	63.9°
2029-10-28 Sun	100	—	unknown	18:55–03:50 (good, 8.92 h)	79.1° 23:25	10.36	66%	75.8°
2029-10-29 Mon	100	—	unknown	18:55–04:35 (good, 9.67 h)	79.1° 23:25	10.4	56%	88.0°
2029-10-30 Tue	100	—	unknown	18:55–04:40 (good, 9.75 h)	79.1° 23:20	10.44	45%	100.5°
2029-10-31 Wed	100	—	unknown	18:55–04:40 (good, 9.75 h)	79.1° 23:15	10.48	35%	113.4°
2029-11-01 Thu	100	—	unknown	18:50–04:40 (good, 9.83 h)	79.1° 23:10	10.51	25%	126.6°
2029-11-02 Fri	100	—	unknown	18:50–04:40 (good, 9.83 h)	79.1° 23:05	10.55	15%	140.0°
2029-11-03 Sat	100	—	unknown	18:50–04:35 (good, 9.75 h)	79.1° 23:05	10.58	8%	152.9°
2029-11-04 Sun	100	—	unknown	18:50–04:30 (good, 9.67 h)	79.1° 23:00	10.62	3%	163.0°
2029-11-05 Mon	100	—	unknown	18:50–04:25 (good, 9.58 h)	79.1° 22:55	10.65	0%	163.1°
2029-11-06 Tue	100	—	unknown	18:45–04:25 (good, 9.67 h)	79.1° 22:50	10.69	1%	152.8°
2029-11-07 Wed	100	—	unknown	18:45–04:20 (good, 9.58 h)	79.1° 22:45	10.72	4%	139.5°
2029-11-08 Thu	100	—	unknown	18:45–04:15 (good, 9.5 h)	79.1° 22:45	10.75	11%	125.7°
2029-11-09 Fri	100	—	unknown	18:45–04:10 (good, 9.42 h)	79.1° 22:40	10.79	19%	112.0°
2029-11-10 Sat	100	—	unknown	18:45–04:10 (good, 9.42 h)	79.1° 22:35	10.82	28%	98.6°
2029-11-11 Sun	100	—	unknown	18:40–04:05 (good, 9.42 h)	79.1° 22:30	10.85	39%	85.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-10-13&days=30"
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&days=30&format=csv" -o m31-calendar.csv

One row per night: score_astronomy always, score_weather / score only where a forecast or history exists (null otherwise, with weather_source saying which), best window, dark hours, Moon illumination and separation, transit. 7–60 nights. Errors: 400 with invalid_date or target_unresolved. Results are cached for six hours; calculation version 2026-10-10.1.